Im trying to setup dual monitors. I have the AMD radeon 6670 hd and it has an hdmi port, vga, and dvi. Im already using the vga for my primary and i have an hdmi to vga cable for my second monitor. Both monitors work but i cant get them to work at the same time because it seems like vga port is the only one working. The hdmi is not being detected. how can i fix this? please ask any additional info if needed.